Tandem means ‘side by side’ as opposed to ‘end by end’ – in this case, tandem lifting is a crane hoisting two container spreaders at the same time. Tandem lifting has opened a new avenue to improving port productivity and efficiency.

What is Tandem lift from crane?

Tandem means ‘side by side’ as opposed to ‘end by end’ – in this case, tandem lifting is a crane hoisting two container spreaders at the same time. Tandem lifting has opened a new avenue to improving port productivity and efficiency.

What is a dual hoist crane?

Alternatively, the headblock may be separated and be connected to two spreaders, as shown in Figure 2. Dual-hoist, tandem lift cranes have two main hoists, two sets of falls, and two headblocks. Each headblock connects to a conventional spreader. © 2007 Liftech Consultants Inc.

What is tandem operation of cranes?

Tandem lift is also an operational procedure that is vastly used in the industrial sector. In this process, the operator can handle more than one crane or hoist at once to lift a huge load. Tandem operation is quite dissimilar to the other functions of an overhead crane.

Is a tandem lift a complex lift?

Sometimes a load is too big, and you need to enlist the help of another crane. The process of lifting loads with two or more cranes is not new, but it is complex.

How much of a crane’s capacity is derated when tandem lifting?

In general we could summarise that for a dual crane lift the capacity chart would have to be derated by 15 %, therefore, each crane should not lift at its initial pick more than 85 % of its capacity.

What is considered a critical lift?

Critical lift means a lift that (1) exceeds 75 percent of the rated capacity of the crane or derrick, or (2) requires the use of more than one crane or derrick.

What is a critical lift?

Can a lift supervisor be a slinger?

It is also possible to apply for a combined Slinger Signaller (CPCS A40) and Lifting Operations Crane Supervisor Course – novice operators with less than 2 years’ experience are eligible to apply.

How is crane load capacity calculated?

Measure geometric components

1. The standard calculation for maximum crane capacity is (r)(hC)/100.
2. R = Radius between the ground and load.
3. hC = Lifting height multiplied by the capacity.

Can a crane lift another crane?

The double-crane lift is not all that uncommon in construction; you sometimes see one on a building’s roof that is hauling up parts for a second. (And here’s a video that’ll blow your mind: a crane lifts a crane that’s lifting another crane that is lifting another crane.)

Is ZPMC the only crane manufacturer to build tandem lift cranes?

To our knowledge, ZPMC is the only crane manufacturer to have built dual-hoist, tandem lift cranes. Figures 3–7 are from ZPMC projects. ZPMC has provided tandem lift cranes for Dubai Port Authority, Yantian International Container Terminals, and other PRC terminals. ZPMC has new orders for at least 45 DHT40 cranes.

Which companies provide tandem lift cranes for Dubai Port Authority?

ZPMC has provided tandem lift cranes for Dubai Port Authority, Yantian International Container Terminals, and other PRC terminals. ZPMC has new orders for at least 45 DHT40 cranes.

What is a tandem lift crane?

“Tandem” means side by side, rather than end to end, in this case. End-to-end lifts are called “twin” lifts. Tandem lift cranes are designed to lift two 20’, 40’, or 45’ containers as well as a single 40’ or 45’ container on one hoist with twin-20’ containers on the other hoist, or four 20’ containers (tandem twin- 20s).

What is the difference between single hoist and tandem lifts?

The single-hoist crane picks a single 20’, 40’, or 45’ container, or two end-to-end 20’ containers (twin-20s), under a single spreader. Two Styles of Tandem Lift Cranes “Tandem” means side by side, rather than end to end, in this case. End-to-end lifts are called “twin” lifts.